I currently have a map that shows state polygons for the US. I would like to be able to have a user double click a state and then zoom into the state and show congressional district (CD) polygons.
I have the individual maps working great using kml. Im not sure what's the best approach for the drill-down from state to CD. The tricky bit is I need the state name/code as thats how I now what KML to generate at the CD level.
I am using google maps api v3.